JMicron/JMB321

Copyright © 2009 JMicron Inc. All rights reserved.

Product Brief

Page 1

2009/01/11

JMB321 Port Multiplier Chip

Overview

JMicron JMB321 is a single chip. It integrated six independent SATA channels and a micro-processor.

With proper setting, the chip can be configured as an 1 to 5-ports Serial ATA II Port Multiplier or a 5 to

1-port Serial ATA II Port Selector.

JMB321 contains 15 GPIOs which can be configured as various standard interfaces. It also has the

capability to load external firmware code to extend its functionality.

Compliance

Spec. Revision 1.2

Revision 1.0

Spec. Revision 1.0

Compliant

with

Serial

ATA

High

Speed

Serialized AT Attachment Spec. Revision 2.5

General

Integrated 6-port SATA II PHY

Integrated PLL for SATA II interface

Total six independent SATA channel

Integrated uP, PROM and SRAM for

firmware programming

Fabricated in 0.13um CMOS Standard

Logic Process

1.3V core and 3.3V I/O power supply

Available in 64-pin QFN

SATA

Supports

6-port

3.0Gbps

SATA

II

interface

Supports SATA II Gen2i and Gen2m

(External SATA Connection, eSATA)

Output swing control and automatic

impedance calibration for SATA II PHY

Supports asynchronous signal recovery

Supports spread spectrum clocking

Supports partial / slumber power saving

mode

Automatically speed negotiation for 3

Gbps or 1.5 Gbps

Supports BIST and loopback mode

Supports staggered spin-up

Supports 48-bit LBA addressing

Supports ATAPI drives

Supports Native Command Queue (NCQ)

Supports Hot-Plug

Supports Asynchronous Notification

Supports PM aware and non-PM aware

host

GPIO

Supports 15 GPIOs

Supports I2C interface

Supports ISA interface

Supports SPI interface

Supports firmware extension

Functional Description

JMB321 is a highly integrated single chip. It integrates six high-speed Serial I/O’s, three SATA upper

layers, a microprocessor, SRAM, PROM, a highly efficient data bus and other control logic into the chip.

JMB321 can work as an 1 to 5-ports Port Multiplier or 5 to 1-port Port Selector using internal embedded